For each of the following activities, identify whether the costs incurred should be allocate to the category of cost of quality: a. Prevention costs b. Appraisal costs c. Internal failure costs d. External failure costs 1. Customer inquiries about incorrect billing statement 2. Workers check/test their work before allowing it to leave their work area 3. Management carries out a quality system audit 4. Repairing an IPhone 5 under the warranty 5. Issuing a recall of defective product before another customer is injured 6. The organization conducts a survey of customer requirements B) What is the difference between internal and external failure costs? And Give an example for each costs?